Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Experimental and numerical investigation on conjugate effects in deep parallel microchannel using tio2 nanofluid for electronic cooling(Dalian University of Technology, 2018) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.The present study reports the numerical investigation of laminar forced convection based on TiO2 nanofluid in a rectangular copper microchannel surrounded by Aluminium block to examine the cooling effects for increased flow rates and particle concentration. The analysis involves the use of pure fluid and TiO2 nanofluid with the volume fractions of 0.01, 0.15, 0.20 and 0.25% for different flow rates. The study also examines the influence of conjugate heat transfer behavior of the microchannel using commercially available software FLUENT-15. © 2018 by the authors of the abstracts.Item Numerical simulation of microgap based focal brain cooling bioimplants for treatment of epilepsy(Dalian University of Technology, 2018) Narendran, G.; Kumar, A.; Gnanasekaran, N.; Arumuga Perumal, D.A.Epilepsy is most common neurological disorder that affects people of all ages and around 30% of the patients do not recover because of existing treatment like medication therapy and surgery. Due to imprudent neuronal activities, excessive heat is observed at epileptic focus and to cool this focal cerebral cooling system is used. Our aim of this study is to enhance the existing design of focal cerebral cooling system by adding constructional structures there by creating micro gaps throughout the cooling device. In this study computational model is developed to perform transient analysis on flow hydrodynamics and heat transfer using commercial package ANSYS FLUENT 15.0. © 2018 by the authors of the abstracts.Item Flow induced hotspot migration studies with heat spreader integrated microchannels using reduced graphene oxide nanofluids(Institute of Electrical and Electronics Engineers Inc., 2018) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.The present study involves experimental and numerical investigations of laminar forced convection in parallel microchannel heat sink accompanied with heat spreader of size 30 mm2. Water and reduced graphene oxide nanofluid of 0.07-0.12 vf % is used as working fluid. The numerical study is performed by incorporating the thermo physical properties of reduced graphene oxide nanofluid for different Reynolds number (Re) ranging from 150 to 360 for a constant heat flux of 35 W/cm2. Additionally, studies on migration of hotspot with heat spreader from the bottom of the heat sink under varying Reynolds number are also discussed. © 2018 IEEE.Item Entropy generation study of TiO2 nanofluid in microchannel heat sink for Electronic cooling application(Institute of Physics Publishing helen.craven@iop.org, 2018) Kumar, A.; Narendran, G.; Arumuga Perumal, D.A.Development of Micro-electro-mechanical systems (MEMS) in the recent years has motivated and necessitated the study of flows in micro-scale geometries such as microchannel. Thermal management in ultra-densely packed electronic devices is highly essential to increase the reliability of the component without compromising packaging. The present study provides an experimental and numerical investigation on laminar forced convection in parallel microchannel heat sink accompanied with integrated Aluminium bulk heat spreader and ultrafine TiO2 nanoparticle based nanofluid for different wt. % ranging from 0.1-0.35 under different power ratings. Numerical study is performed to understand the flow hydrodynamics in microchannel to investigate the temperature distribution in bulk heat spreader with increased flow rates by implementing the thermo-physical properties. Furthermore, a study on Exergy and entropy generation for different fluids is also discussed. The experimental studies reveal that parallel microchannel increases the effectiveness of integrated cooling with a marginal temperature deviation between the heat sink and Aluminium bulk for a distance of 1.5 mm. Implementation of TiO2 nanofluid registered as a better working fluid than the pure fluid for all the experimental settings. © Published under licence by IOP Publishing Ltd.Item Hydrodynamic Performance of Graphene Oxide nanofluid in heat spreader integrated microchannel(Toronto Metropolitan University, 2019) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.Thermal design consideration is highly essential for managing advanced microprocessors which are subjected to conjugate heat transfer under high heat flux with a minimal area for cooling. These multicore processors develop a localized high density heat flux referred as hotspot. It is often reported that the flow hydrodynamics in the channels thrive the hotspot zones in the microchannel heat sink (MHS) that effectively reduces the cooling performance in advanced 3D processors with varying power map cores. In this present study an experimental setup was developed to investigate the flow hydrodynamic and conjugate heat transfer performance of rectangular microchannel by using a thin heat spreader. Graphene Oxide nanofluid is used as the working fluid with three volume fractions (0.02%, 0.07% and 0.12%) for increased Reynolds number range from 150 to 260. Figure of Merit on thermal performance of nanofluid based on different influential factors has been investigated and the best suited nanofluid under various circumstances was found to be 0.12%-Graphene Oxide. © 2019, Toronto Metropolitan University. All rights reserved.Item Migration of flow inducted hotspot with heat spreader integrated microchannel subjected to asymmetric heat flux: A Multiphysics approach(Institute of Electrical and Electronics Engineers Inc., 2019) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.The heat spreader integrated microchannel heat sink is employed in thermal management of transient hotspot problem in multicore processors for high density electronic cooling application. The heat transfer characteristics of heat spreader integrated microchannel were comprehensively analyzed experimentally and numerically, and their effectiveness and thermal enhancement factor was compared with the regular microchannel. By using deionized water and Graphene oxide (GO) nanofluid as working fluid, investigations were conducted for Reynolds number ranging from 100-300. Multiple hotspot cores were modelled in the microchannel with four different heat fluxes to study the temperature responses in the heat spreader under transient thermal loads. Additionally, studies were conducted to address the thermal stress developed in the packaging of heat spreader integrated microchannel in multiple hotspot conditions. The result shows that the thermal effectiveness of GO-0.12% increased 65% as compared with pure fluid. © 2019 IEEE.